how can i make a % of a specific mob spawn as a boss mob

is there a way i can make 1% of zombies spawn naturally as a mini boss? /summon zombie ~ ~ ~ {CanBreakDoors:1,Health:75,attributes:[{id:attack_damage,base:9f},{id:scale,base:1.5f},{id:follow_range,base:40f},{id:attack_knockback,base:3f},{id:knockback_resistance,base:1f},{id:max_health,base:75f}]}